Blade holder



April 1952 D. N. JUDELSON 2,594,932

v BLADE HOLDER Filed March 50, 1949 INVENTOR. David N. Judelson BY i Z ATTORNEYS Patented Apr. 29, 1952 UNITED STATES PATENT OFFICE BLADE HOLDER David N. Judelson, Parkridge, N. J.

Application March 30, 1949, Serial No. "84,385

4 Claims. 1

My invention relates to a new and improved holder for one or more cutting blades. This application is a continuation-in-partof my application Serial No. 18,613, filed in the United States Patent Office on April 2, 1948, now Patent Number 2,526,029 dated November 1'7, 1950.

The invention is particularly useful as an attachment to machines for cutting sheet material into strips, as explained in my said Patent 2,526,029.

According to my invention, the respective blades can be easily inserted into operating position, and worn or defective blades can be easily removed.

Other objects of my invention will be stated in the annexed description and drawings which illustrate a preferred embodiment thereof.

-Fig. 1 is an enlarged perspective view which shows a series of cutting blades and the means for holdin them.

Fig. 2 is a section on the line 2-2 of Fig. 1.

Fig. 3 is a section on the line 33 of Fig. 2.

Fig. 4 shows a difierent embodiment for connecting the blade-holding bars to the supporting block.

In operating such machines, it is often necessary to run piece goods of difierent widths through the machine and to have difierent spacings between the cutting knives. If the holder for the cutting knives is a fixed part of the machine, this requires considerable time and labor to change over from one arrangement of cutting knives to another arrangement of cutting knives. It may take as long as five hours to insert the cutting blades in the desired number and spacing.

One of the important features of my invention is that the entire assembly is part of a block which can be easily removed from the machine and replaced by another block. It is therefore possible for the owner of the machine to have a series of different sets of cutting knives, each located in its own block. Therefore when it is necessary to change from one set of cutting knives to another, it is not necessary to make a change in the machine, while the machine is kept idle. According to my invention, it is merely necessary for the owner to have a number of different sets of cutting knives and to replace the block of one set with the block of another set, so that the substitution can be made very quickly and cheaply.

Fig. 1 shows a block or bar 51 which is illustrated as having a body which has a rectangular cross section. Fig. 1 also shows an angle bar 6! which is fixed to said bar or block 51. A series of blade-holding bars 62 are detachably fixed to the bar 51. .Each blade-holding bar 62 has a bottom recess which interfits with the top .portion of the bar 51, which extends into said recess. Said recess is of rectangularshape, and the bladeholding bars 62 interfit closely with bar 15. These blade-holding bars 62 may be of any desired width. The inner end of each blade-holding bar 62 abuts the base leg of angle bar 6!. .Said base leg of angle bar BI is shown in the vertical :position inFig. 1. Each bar 62 is fixed detach'ably to the bar 51 by a respective clamping screw 163a, whose shank extends through a respective tapped bore of the'free leg of angle bar 6|. This free leg is shown in the horizontal position in Fig. 1. These clamping screws 63a are arranged in two lateral rows.

Each cutting blade 63 may be a razor blade which is fixed to a channel-shaped head 64 which has longitudinal edges 64a, which are parallel to the cutting edge of the blade.

As shown in Fig. 2, the front end-portion of each blade-holding bar 62 has a longitudinal slot 61 into which a respective blade 63 can be inserted.

As shown in Fig. 2, each slot 61 has an inner or rear end-wall 6101, which is inclined rearwardly relative to the longitudinal axis of slot 61. Each blade-holding bar 62 has a lateral stop pin 64!) fixed thereto. When a blade 63 is inserted, the inner or rear transverse edge of said blade '63 abuts the respective stop pin 642). Each stop pin 641) extends laterally through the walls of the legs of the respective slot 67.

Each blade head 64 is clamped in position .at its edges 64a, which abut internal shoulders of the slot 61., The clamping pressure is exerted by a respective clamping bar 65, which is forced into clamping position by a clamping screw 66. Each clamping screw 66 has a threaded shank which engages the internal thread of a respective tapped recess or bore of the respective bladeholdin'g bar 62. flange a which abuts the respective blade-holding bar 62.

As one example, and without limiting the invention thereto, the edges 64a are inclined at an angle of to the inner walls 61a of the slots 61.

The entire block 51 can be assembled with any desired number of blade-holding bars 62, which fit snugly between the end-walls 51a of the rec'ess of the block 51.

When the blade-holding bars 62 have thus been assembled with the bar 51, the clamping screws 63a are applied, thus firmly clamping the blade- Each clamping bar 65 has a rear.

holding bars 62 to the block 51, thus forming a rigid assembly in which the blade-holding bars 62 cannot move relative to each other, or to the bar 51. The cutting blades 63 are then assembled with the blade-holding bars 62, and the clamping bars 65 are then applied and forced into clamping position and held in clamping position by means of the screws 66.

If it is necessary to replace one of the blades 63, this can be done very easily and quickly without disturbing the entire assembly, by merely removing the respective screw 66 from the respective blade-holding bar 62, and temporarily removing the respective clamping bar 65. The clamping bar 65 can then be readily replaced.

As above noted, when this assembly has been made, the bar 51 can be easily inserted into the cutting machine or removed therefrom as a single unit with all the blades, by the means disclosed in my aforesaid application Serial No. 18,613.

It therefore takes only about two minutes at the most to remove one complete assembly from the machine and to replace it by another complete assembly which has the desired number of cutting blades 63, assembled in the desired lateral relation.

The vertical leg of the angle bar 6| is fixed in any suitable manner to the rear wall of the block 51.

In the embodiment of Fig. 4, the block 51 is provided with a through-and-through T-shaped groove or slot T which has a lower portion 51cm and an upper and narrow portion 511). This T-shaped slot T is open at both end-walls of the block 57 and also at the top of block 51. Fig. 4 also shows a part of the rear end of a bladeholding bar 62 and it shows the recess 62a of said bar 62, which interfits closely with the top part of the block 51. A series of clamping screws are slid into the T-shaped slot T through its open end at either end-wall of the block 51. Each of these screws has a head H and a threaded shank S. Each said shank S extends through top slot-portion 51b and an untapped bore of a respective bar 62. A clamping nut N is then applied to each shank S, thus clamping the respective blade-holding bar 62 firmly to the holding or assembly block 51 and also clamping each screw in position in slot T. The screws can thus be located in said T-shaped slot T, either with their heads H touching each other or suitably spaced as required. The heads H are of suitable square or rectangular shape, so that they fit snugly and without turning in the wide part Slam of the T-shaped groove. When a nut N is then applied, the screw is also firmly clamped in position so that it is not necessary to have the heads H abut each other. In this embodiment I retain the bars 65 and the screws 66.

As shown in Fig. 3, each longitudinal slot 61 of each bar 62 has an enlarged top portion. The bottom walls of said enlarged top-portion are inclined upwardly and rearwardly so that both edges 64a of the head 64 abut the internal shoulders which are provided by said enlarged topportion of slot 61, so that edges 64a are firmly held in the inclined position shown in Fig. 1 and Fig. 2, when the clamping pressure of bar 65 is applied.

As shown in Fig. 2, the bottom face of the front end-portion of the clamping bar 65 touches the top of the head 64, along a single lateral line, so that the entire clamping pressure of bar 65 is exerted very close to or almost at the front end of the slot 61. This clamping pressure forces each blade 63 rearwardly until its rear transverse edge firmly abuts the stop pin 64b, under suitable pressure.

The untapped bore of bar 65, through which the smooth part of the shank of screw 66 extends, may be of slightly greater diameter than said smooth part of said shank. Hence, when the clamping pressure of screw 66 is exerted, the clamping bar can turn slightly on its leg 55, at the line or area where leg 65a abuts the top planar wall of blade-holding bar 62. The clamping bar 65 makes only line contact with the top of head 64, at the tip of clamping bar 65. This tip of clamping bar 65 is urged to move downwardly and rearwardly under the force of clamping screw 66, thus sliding the head 64 and its rigidly aflixed blade 63 rearwardly, until the rear transverse edge of blade 63 is forced and held under pressure against the cylindrical stoppin 641), which makes only a lateral line contact with the rear transverse edge of blade 63.

Save for Fig. 4, the disclosure herein is also disclosed in my application Serial No. 18,613.

For convenience, the device is described in the claims with reference to its position of Fig. 1, although the assembly shown therein swings in the machine, as explained in my application Serial No. 18,613.

I have described a preferred embodiment of my invention, but it is clear that numerous changes and omissions and additions can be made without departing from its scope.

I claim:

1. A blade holder for a single-edge razor blade having an enlarged head said blade holder comprising a holder bar which has a longitudinal axis and front and rear ends, said holder bar having a through-and-through vertical holder slot, said holder slot having a top slot-portion and a bottom slot-portion, said top slot-portion being of greater width than said bottom slotportion, said slot having slot shoulders at the junction between said slot-portions, said slot shoulders being inclined to said longitudinal axis, the front ends of said slot shoulders being lower than the rear ends of said slot shoulders, clamping means connected by connecting means to said bar and adapted to clamp a blade in said slot with the enlarged head of said blade held against said shoulders, and a portion of said head projecting out of the top slot-portion, said clamping means being wholly external to said slot and having a part overlying said top slot-portion and being movable downwardly towards said top slot-portion into contact with said projecting blade portion, said connecting means being located rearwardly of said slot.

2. A blade holder according to claim 1 in which said clamping means is a clamping bar whose front part is said overlying part and whose rear part abuts the top of said holding bar, said connecting means being a vertical screw which is located forwardly of said rear abutting part, said screw extending through a tapped opening of said holding bar and having a head which engages said front part.

3. A blade holder according to claim 1 in which said overlying part is substantially parallel to said slot shoulders when said clamping means are in final clamping position.

4. A blade holder according to claim 1 in which said clamping means is a clamping bar whose front part is said overlying part and whose rear part abuts the top of said holding bar. said connecting means being a vertical screw which is located forwardly of said rear abutting part, said screw extending through a tappedopening of said holding bar and having a head, which engages said front part, and said overlying part is substantially parallel to said slot shoulders when said clamping means are in final clamping position.

' DAVID N. JUDELSON.

REFERENCES CITED The following references are of record in the file of this patent:

Number 6 UNITED STATES PATENTS Name ,Date -Hoople Qct.=8, 1 889 Hinthorn June 28, 1398 Good NQY.3 O ,"1926 sahi A -31,; 1937 Bodkin Decril, 1942 Felardo Ot.'8, 1946 Willis Nov. 1, 1949 Carroll Dec. 27,1949 

